Contact for induction-coils.



J. MoINTYRB. CONTACT FOR 11111110111011 coiLs. APPLIUATION FILED 11011.17, 150a.

Patented Feb. 28,1911.

ATTORIVE Y8 Todd-Jim. i.-

one and without disturbing any part of the I and parts and combinations of. the same,

which will be more fully described herein- JOHN McI-NTYBE, or mnssrcrrr, new mnsmr.

.con'rac'r FOR innvc'rron-coms. t

To all whom 'it may concern: V Be itkuown that I, JOHN MCINTYRE, a citizen of the United States, and a resident I a of Jersey City, in the county of Hudson and State of New Jersey, have invented a new and Improved Contact for Induction-Coils, of which thefollowing is a full, clear, and exact description.

The object of the invention is. to provide a new and improved'cont'act for induction coils and like electrical apparatus, arranged to allow convenient and quick replacing of apparatus The invention consists of. novel features after and then pointed out in the claims.

.A practical embodiment of the invention is represented..in the accompanying draw ings forming a part. of this specification, in which similar characters of reference indi-v cate corresponding parts in all the views.

Figurel is a side elevation of the improvement, showin the platinum contact and its holder applied to a yielding carrier and controlled by an adjustment screw; Fig. 2 is a vertical section of the same; Fig. 3 is an enlarged verticalsection of the contact, the carrier and the adjustment screw: Fig. 4 is a perspective view of the contact; Fig. 5 is a vertical section of a modified form of the improvement, showing the carrier for the contact'in the ,form of an adjustment screw; Fig. 6 is a vertical section of a modified form of the improvement, showing the carrier. for the contact in the form of a bridge; and Figs. 7, 8 and 9 are vertical sections of modified forms of the contact.

In the manufacture of inductioncoils and similar electric apparatus, it has been the practice to solder the platinum point or face to the endof the adjustment screw, bridge or other carrier, or to provide the platinum point with a shank driven into a recess in the carrier, or. to screw the platinum point on such carrier, and in addition solder is usually employed to fasten the driven plati num point or the screwed one in position on the carrier. It is well known that in practice the soldered platinum point frequently falls ofi' its carrier owing to the melting of the. solder by overheating of the contacts Specification of Letters Patent. Application filed November 17, 1908. Serial ljlo. 463,024,

tir'ecarrier is discarded and replaced by a Patented Feb. 28; 191;.

incident to the electric are at .thetcontact points. The repeated expansion and contraction of the I carrier and the hammeringit receives b the action of the vibrator also tends to.- ooscn the hold of. the platinum pointon its carrier, and"tl1e. said -p.oint finally drops out of position. Furthermore, users of the inductioncoil frequently resort to filing the faces of the platinum contact points toinsure a hettercontact, but unless such filing operation is very. skilfully and lightly conducted it tends to .;loosen the platinum contact point. In order to .;replace" I a fallen off contact -'po int,on ,the carrieror to provide the latter w tlra new one, it is usually necessary ,to remove the carrier. from the apparatus, but more frequently. the en- 7 new one; In order to a-ijoidlaccidentaldetachmentof the platinum. pointxfromits carrier and to allow convenient and quick replacing of a worn out 'eonta'ct .point by a new one, -is the object ofvthe. im ention'pres I v entlyto be described mama; 1

. -\s illustrated in Figs. 1 and .2,l the adjust .ment screw A screws n1- the;hridgc' B and on the end of the said adjustmcntscrew is. re movably held a contact. consisting of .a ,tubular holder .C, a platinum )oint..I),-and means presently to he descri d in detail and arranged within the .--tnbular. holder- C for permanently securing .the platinum point D in place on the holder C." It is =un derstood that the platinum point D operates in conjunction with the latinum contact F. on the'vibrator Fof the induction coil.

The platinum point D is permanently fastened to the tubular holder. G as folldFs: The holder C as shown is in theform ofa cylindrical cap'having its bottom or closed end C provided with an aperture forthe passage of-the shank D of the platinum.

point I), the inner end of the shank D being riveted to the closed end C, to form a rivet head I) at the inside-thereof to permanently fasten the -platinumpoint in position on the cap. Solder G: is preferably placed within' the cap to cover the riveted portion or head I) ofthe shank D of the platinum oint D, thus assisting in holding the point" absolutely and permanently in place on the cap, the contact, consisting of the permanently united ea) or holder C and the platinum point I). oi'ming a new article of manufacture which can be sold in quantities and used f 20 justment screw A iip'or down for adjusting I bythebuyers of the induction coil, in case 1t ,1s desired to interchangea worn out contact with a new one. Y

lhe holderlor cap G fits loosely into a recess A in the end of the adjustment screw ablyby passing the shank-D"through .an

'a'perture in the spring H, thus having the underside of the spring resting on the shoulden of the platinum point, and the top of'the spring abutting against the end 6 i of the cap or holder C. The side arms of the spring H engagethe sides at the bridge B, to hold the spring H and consequently the contact CD from turning;.-'}fwhen screwing the adthe pl atinum point D relative to the platinum contact E on the vibrator of the-induction coil. It is understood that the angular side arms' of the. spring H bear with suflicient force against the sides of the bridge- B, to hold the spring-arms firmly in place.

As shown in Figs. 5 and 6, the spring H is omitted and the contact CD is removably secured to the adjustment screw A, and turns with the same when screwing the adjustment screw A up or down in the bridge B. For the purpose mentioned the cylindrical cap or holder 0 is forced into a seat or recess A formed in the end of the adjustment screw A the seat A being preferably tapering and the wall of the cap or holder C being preferably thin so that the capor holder 0 when driven into the seat A engages the latter .with a driving fit, thus requiring no other fastening means for securing the holder or capC in position on the adjustment screw A In orderto permit convenient removal of the holder or -cap Cand it's' platinum point D in .case the latter is worn out the adjustment screw A is provided with a bore A forming a continuation. of the seat or recess A, and into whichbore can be inserted-a nail or other tool for driving out the holder or cap C whenever it is desired to replace the ,worn out contact by a new one.

Asillustratcd in Fig. 6, the'contact instead of being attached to an adjustment screw is driven with its cap or holder G into a seat formed on the bridge I. it being understood that the spring U or the adjustment screw A or A or the bridge 1 of the induction ooil mayform acarricc for receiving and securely'holdin; the contact, consisting of the 7 'p'e'mianently united cap-or holder C and the platinum point D.

As shown in Fig. 7 the cap or holder C is driven onto a projection A formed on the adjustment screw A.

Although I prefer securing the cap G in.

position on the contact carrier as described, other, means may be employed for the purpose, for'instance, the cap maybe provided with interior screw threads (see Fig. 8) or.

- It will be noticed that even should the solder become melted at times, it soon solidifies around the riveted portion or headD on reduction-of the heat, to serve its useful purpose.

By making the cap or tubular holder of thin metal, it readily conforms to the shape of the tapering-seat, and it is possible to reduee the length of the shank .D of the plati num point I) to-a minimum, thus saving in.

material of the expensive platinum point.

" Having thus described my invention, I claim as new and desire tosecnre by Letters Patent:

' '1. As an article of manufacture, a contact, and a spring onlwhich the said contact is secured, the contact consisting of a tubular holder, a' platinum point having a reduced shank extending through an aperture-in the said spring andinto the said ,tubular holder,

the shank havinga rivet head within the said tubular holder for permanently securing the said platinum point to the said holder and the cdtitact to the said spring.

2. An inductiomcoil provided with an ad-' justment'screw havinga seat, a spring, and a contact attached'to the said spring and comprising a holder having one end removably fitting the said seat, and a platinum point perinanently secured to the other end of the said holder.

i 13. An induction coil provided with an adjustment screw having a seat and ,an aper.-.

ture leadingto the said seat, a tubular holder having one end removably fitting the said seat and adapted to be forced out of the same by the insertion of a tool in the said aperture, andfa platinum point permanently securedto the other end of the said holder. In testimony whereof I have signed my name to this specification in the presenceof two subscribing witnesses.

JOHN McINTYRE.

Witnesses-z 'Timo: G. Hos'rnn, J. P. 'DAvIs. 

